Valve-operating mechanism



Dec. 31, 1929. R. w. A. BREWER VALVE OPERATING MECHANISM Filed July 15.192.7 2 Sheets+Sheet l 7 INVENTOR m MZ-M ATTORNEY Patented Dec. 31, 1929PATENT. OFFICE ROBERT W. A. BREWER, 0F JENKINTOWN, PENNSYLVANIA,ASSIGNOR TO HAROLD F. PITCAIRN, 0F BRYN ATHYN, PENNSYLVANIAVALVE-OPERATING MECHANISM Application filed July 15, 1927.

This invention relates to valve operating mechanism of the type in whichthe valve is actuated by a rocker arm in turn actuated by an operatingrod.

One of the primary obj ects-of my invention is the provision of animproved valve operating device which is simple in construction, easy toassemble, and reliable in operation.

Another object of my invention is the provision of a device of thecharacter described in which objectionable thrusts on the rocker arm areobviated.

Still another object ofmy invention is the provision of a device of thecharacter described in which adjustments can be made in a very simplemann r. v

A more specific 0 ject of my invention is to provide a: device of thecharacter described in which the movement of the operating rod issubstantially axial. I

How the foregoing,together with such other objects and advantages as mayhereinafter appear, or are incident to my invention, are realized, isillustrated in preferred form in the accompanying drawings, wherein-Fig. 1 is a fragmentary front elevational view of an internal combustionengine show ing my invention applied thereto, certain of the partsappearing in section.

Fig. 2 is a fragmentary side elevation of Fig. 1 looking toward theright of Fig. 1 with certain valve operating parts appearing in section.I

Fig. 3 is a fragmentary enlarged section taken on the line 33 of Fig. 1.

Fig. 1 is a section taken on the line 4-4 of Fig. 3, and

Fig. 5 is a plan view of Fig. 3 with the cover removed.

Referring now to the drawings and particularly to Figs. 1, 2 and 3, itwill be seen that the reference letter A denotes one cylinder of amultiple cylindered internal combustion engine, such asthe radial typein which the valve operating rods are obliquely disposed with relationto the valve rocker, and the reference letter B denotes a portion of thecrank case, the cylinder-being provided with a piston C. Each cylinderof the engine 'is providedwith an intake and an exhaust valve Serial No.205,865.

located in the upper portion of the cylinder, and in Fig. 3 I haveclearly illustrated oneof the valves, in this instance the intake valveof a the engine. Each valve is operated by a valve operating deviceindicated as a whole by the reference letter D.

Each valve operating device D comprises, in general, a rocker arm 6,(see Figs. 3, 4 and 5) and an operating rod 7. The operating rod 7 isactuated by a cam 8 which is driven from the crank shaft of the engineby means of suitable gearing provided for the purpose of causin openingand closing of the valves at the proper time as is well understood inthe art. A tappet 9 carrying a roller is interposed between the lowerend of the rod 7 and the cam 8, which tappet reciprocates in a sleevemember 10 in the casing B. The tappet is suitably socketed to receivethe balled end of the rod 7.

At its upper end the operating rod 7 is soeketed in a lever 11 by meansof its balled end and the rounded recess 12 in the lower surface of thelever. The lever 11 is pivotally mounted at 13 on the base member orsupport 14 and has its free end interposed be tween the operating rod 7and the rocker arm 6. The upper surface 15 of the lever 11 is curved andcontacts with the ball shaped roller 16 carried at one end of the rockerarm, whereby substantially rolling contactobtains as between the rockerand the lever.

The other end of the rocker arm is provided with a roller 17 whichengages the valve stem of the valve 18, and the rocker is provided witha fulcrum 19 intermediate its ends on which it rocks as it is actuatedby the operating rod 7. The manner of mounting the fulcrum 19 willappear hereinafter.

Referring now more particularly to Figs. 1 and 4, it will be seen thatowing to the disposition of'the valves in the cylinders and to thecentral location of the earn 8, the operating rods 7 are obliquelydisposed with respect to the rocker arms by virtue of which, withoutprovision to the contrary, certain objectionable oblique thrusts wouldbe imposed on the rocker arms. I aim to obviate objectionable thrustsonthe rocker by means of the lever 11 hereinbefore mentioned, the freeend of which is interposedbetween the rod 7.and the rocker 6. Byemploying such a lever it will be seen that angular thrusts such aswould be imposed on the rocker if the operating rod bore directly on therocker are translated into thrusts in adirection to move the rockerwithout subjecting it to appreciable transverse stresses. The locationof the pivot pin 13 of the lever 11 is such as to obtain this result.This is clearly illustrated in Fig. 4

by the arrow which shows the direction of cured to the cylinder castingin any convenient manner, as by means of screws 26. The

Y support 14 constitutes the base portion of what may be termed a rockerbox, the remaining portion being constituted by the cover member 27,which cover is held in place by one of the screws 26 and bythe securingmeans 28.

In order to normally hold the shouldered portion 2 1v of the stud 23against the seat 25, I have provided a'spring 29 interposed between therocker box cover 27 and the nut or headwhich is secured to the post 23.In

this connection, it is pointed out that the stud also tends to seat byvirtue of the upward thrusts on the rocker arm. The spring 29 merelyserves to take up any lost motion between the rocker arm and itsassociated operating rod and Valve.

The rocker arm 6 is laterally positioned by means of the guides or horns31, in this instance extending upwardly from the support 14C. In theoperation of engines of the character described, it becomes necessary,from time to time, to adjust the relation of the rocker to the operatingrod and valve and with the object in view of providing simple andreadily accessible means for accomplislr ing this, I have extended thethreaded stud 23 to project outside the cover 27 and have provided thenut 30 for rotating the stud. By rotating the stud the rocker may beraised or lowered as the case may be, and the desired adjustmenteffected. A suitable catch device as the snap spring 32 engaging notches33 in the nut 30 is provided to hold the stud in its adjusted position.The exact vertical displacement of the rocker may be indicated bysuitable gra'duations on the operating nut. The lateral guides 31 abovementioned hold the rocker against turning when adjustment is being made.

From the foregoing it will be seen that I have provided a very simplemounting for the rocker which is inexpensive to manufac ture and veryreliable. Inthis instance, the rocker ismade of two flat plates bridgedtogether at the ends by the pins 34 and 35 of the rollers 16 and 17,respectively. The fulcrum or rocker pin 19 is a simple round pin of alength corresponding to the width of the rocker and provided with athreaded aperture. The valve operating device D may be easily assembledand disassembled. To disassemble the device the nut 30 is first removedand then the cover or housing 27 is removed by taking out the screws 26and 28. The

rocker arm 6-may then be removed by merely ing and provides a channelfor-the passage of lubricating oil.

, In this connection, it is pointed out that by socketing the upper endof the operating rod in the lever 11 as hereinbefore described, themovement of the operating rod is almost wholly axial, any lateralmovement at the upper end being very slight. By such an arrangement I amenabled to employ a shroud tube of relatively small diameter.

' I claim 1 I 1. A valve device for internal combustion enginescomprising, in combination, a support, a valve,'a valve operating rod, avalve rocker having a pivot member, a rocker housing, a threadedrotatable stud on which the pivot member is secured, said stud having ashoulder adapted to engage said support, and means for holding saidshoulder against said support. 2. A valve device for internal combustionengines comprising, in combination, a support, a valve, a valveoperating rod, a valve rocker having a pivot member, a rocker housing, athreaded rotatable stud on which the pivot member is screwed, said studhaving a shoulder adapted to engage said support, and resilient meansfor holding said shoulder against said support, together with means forpreventing the rocker from rotating with said stud.

3. A valve device for internal combustion engines comprising; incombination, a support, a valve, a valve operating rod, a valve rocker,a rocker mounting, a rocker housing, and means extending through saidmounting,

port

- support, a valve,

v rocker and its.

said support and said housing for holding the mounting inplace.

4. A valve device engines comprising, inv combination, a support, avalve, avalve operating 'rod, a valve rocker, a rocker mounting, arocker housing, and means extending through said mounting, said supportand said housing for holding the mounting in place, together with meansof adjustment for said last-named means located exteriorly of saidhousing.

5. A valve device for internal combustion engines comprising, incombination, a fixed support, a valve, valve rocker, a rocker fulcrum,support, said fixed support having an aper.-- ture for receiving saidfulcrum support,'said fulcrum support having a portion adapted to engagesaid fixed support, a rocker housing detachably secured to said fixedsupport, and means engaging said'housin'g and said fulcrum support crumsupport in engagement with the'fixed support.

6; A valve device for internal combustion engines comprising,

rocker, a rocker fulcrum, a fulcrum support, said'fixed support havingan aperture for receiving said fulcrum support, said fulcrum supporthaving a portion adapted to engage said fixed support, a rocker housingdetachably secured to said fixed support, and means engaging saidhousing and said fulcrum support for normally holding the fulcrumsupport in engagement with the fixed support, to-

gether with means carried by said fixed supsaid valve rocker.

7. A valve device for internal combustion engines comprising, incombination, a fixed a valve operating rod, a valve rocker, a fulcrumpin for the rocker having a central screw threaded aperture, and a.screw threaded supporting stud for the engines comprising, incombination, a fixed support, a valve, a valve operating rod, a valverocker, a fulcrum pm for the rocker 'havin g a central screw threadedaperture, and a screw threaded supporting stud for the rocker and itsfulcrum pin, a housing detachably secured to the fixed support, andmeans" exterior of the housing for rotating said stud to move the rockerand its pin axially of said stud.

In testimony whereof I have" hereunto signed my name.

ROBERT w. A. BREWER.

for internal combustion a va'lve operatingrod, a a fulcrum for normallyholding the ful-' in combination, a fixed support, a valve, a valveoperating rod, a valve for preventing lateral displacement of fulcrumpin, said stud being rotatable to move the rocker and its pin. ax-

ially of the stud through the medium ofthe aforesaid screw threads.

8. A valve device for internal combustion

